Apparatus for neutralizing static electricity.



W. H. CHAPMAN. APPARATUS FOR NEUTRALIZIKG STATIC ELECTRICITY.

APPLICATION FILED 71111.23, 1908.

Patented Oct. 13, 1908.

Lt; CZZZMJW fl w UNITED STATES; PATENT OFFICE.

WILLIAM H. CHAPMAN, OF PORTLAND MAINE,

APPARATUS FOR NEUTRALIZING STATIC ELECTRICITY.

Specification of Letters Patent.

Patented Oct. 13, 1908.

Application filed January 23, 1908. Serial No. 412,232.

' ticularly to means for applying the process set forth in my Patent No.777,598 dated Dec. 13, 1904:. Since said process has been put intopractical use I have used several forms of conductor for discharging orradiating the high tension static charge ontothe paper or other materialto be treated. These means have included a simple wire held parallel andadjacent to a wooden bar, a bar of nonconducting material having thewire embedded therein with branches terminating at the surface of thebar in fine points which radiated the static charge and other forms. Inall of these forms of inductor as I term this member, the wire wasconnected with the source of high tension electricity and was itselfinsulated so that anybody coming in contact with the wire wouid receivea spark. In textile mills and other places where the inductor was liableto he touched by the help, this sparking was an noying and there wasalso danger of setting fire to the lint or other inflammable material.

The object of my invention is to provide an inductor which may behandled with impunity without giving off any shock or spark and whichwould be at least as effective as any other form of inductor and withthat end in View the invention consists of a hollow perforated conductorconnected toearth and having therein an insulated conductor as a Wirecontaining small surfaces or points for radiating the charge and whichis connected with a source ofelectrical energy by which it is chargedwith a high tension charge. An induct-or ofthis character is found toeffectively radiate the high tension charge through the perforations inthe hollow conductor and at the same time may be safely handled withoutreceiving a spark or shock of any kind.

- cured one end of the wire.

I illustrate my invention by means of the accompanying drawing in which-Figure 1 is a central longitudinal section through my improvedinductor, Fig. 2 is an enlarged cross section on the line 90 00 of Fig.

1 and Fig. 3 is a detail section of the wire holding plug. a

The hollow conductor is here shown in the form of a perforated cylinderwhich is made up of a plurality of standard sections, in this case, twoin number, A and A as many units or sections being used as is necessaryto cover the width of the paper or other moving material to be treated.

(1 represents the perforations which may be of any desired size or shapealthough I prefer to use ordinary perforated tin or brass containingnumerous holes.

Each section has fitting in its end a head j which is centrallyperforated by a screw threaded opening. The heads are riveted, solderedor'otherwise secured in place. The central opening in the heads areuniform so that the various fittings will fit eachhead.

An interior insulated conductor from which the high tension charge isradiated is provided and this conductor has small surfaces of such smallarea that high tension charges will pass freely from it into the air. Iprefer for this purpose to make use of a wire B which is stretchedlongitudinally through the center of the cylinders A A be.- ing securedat the ends and insulated from the cylinder.

For the purpose of holding the wire and insulating it I make use of aninsulated plug 9 at one end of the tube and a plug C at the other. Theplug 9 has a small central screw threaded perforation extending aportion of the way through from the inner end and in this perforation isa screw b to which is se- As here shown, a short section of spiralspring I) connects the end of the screw 7) and to the end of the wire Bto take up any slack in the wire. In the outer end of the plug 9 is ascrew threaded into which is screwed the end of the cable I) connectedwith the source of electric energy, the inner end of the cable making ametallic connection with the inner end of the screw 7) T he plugs C andprojcct into insulating surface separating the wire from the head,annular grooves are formed.

The insulating plug C is similar in construction to the plug 9 fittingin the head 7' withv a central perforation on its inner end throughwhich passes the wire B. The end of the wire B is'secured by a wireholding plug d which is screwed into a screw threaded recess in theouter end of the plug C.

The plug (1 has a central longitudinal perforation through which thewire is threaded and the end of the wire is twisted around a knob d onthe outer end of the plug and passes through a lateral hole d in theknob. In this way the wire is easily inserted and firmly held in place.

An insulated cap e fits in a recess in the outer end of the plug C andcovers the end of the Wire and the plug 03.

'Adjacent sections of the cylinder are fastened together by a standardnipple 2' which passes through the adjacent heads and extending throughthe nipple is the insulating guide 7 having a central opening throughwhich passes the wire B. The ends of the guide are formed with annulargrooves f to increase the insulating surfaces as already described inthe end plugs.

A suitable binding screw in the metal cylinder A connects by means of alive wire h to the ground.

The perforation may be as stated of any desired size or shape as forinstance, a longitudinal slot may be run the whole length of thecylinder but the essential thing is to allow the; radiations from theWire conductor to pass through the walls of the cylinder unobstructed.

An inductor constructed in this manner has greater efliciency than thosehitherto used since it radiates electricity in all directions 7 andhence is adapted for work where the material occupies considerable spacelike windmg machines and other machines in textile mills where thisinductor may be placed among the strands and will act above and below atthe same time.

The inductor may be safely handled without danger of getting a shock, itmay be applied to a great variety of work and it is absolutely safe asfar as fire is concerned. It may also be used With whatever kind ofcharge is used for neutralizing the material whether alternating ordirect.

I claim 1. The herein described apparatus for neutralizing staticelectricity consisting of a hollow conductor connected to earth andhaving one or more openings through its walls and an electricallycharged insulated conductor with small radiating surfaces secured withinsaid hollow conductor.

2. The herein described apparatus for neutralizing static electricityconsisting of a hollow perforated cylindrical conductor connected toearth and an electrically char ed insulated conductor with smallradiating surfaces secured longitudinally within said cylinder.

3. The herein described apparatus for neutralizin static electricityconsisting of a hollow perforated cylindrical conductor connected toearth and an electrically charged insulated wire secured longitudinallywithin said cylinder.

4. The herein described apparatus for neutralizin hollow perforatedcylindrical conductor connected toearth and an electrically chargedinsulated wire secured in the axis of said conductor.

5. The herein described apparatus for neutralizin static electricityconsisting of a hollow per orated cylindrical conductor connected toearth, a plug 'of insulating material in each end, a Wire connectingsaid plugs and I an electric cable terminating in one of said plugs inelectrical contact with said wire.

6. The herein described apparatus for neutralizing static electricityconsisting of a hollow perforated metal cylinder connected to earth,each end of said cylinder having a head with a central screw threadedopening therein, a plug of insulating material adapted to screw intoeach of said openings, longitudinal openings in said plugs, a wireconductor extending between said plugs and having its ends secured -insaid openings and an electric cable terminating in one of said plugs andmaking electrical contact with one end of said wire conductor.

7. The herein described apparatus for neutralizing static electricityconsisting of a hollow perforated metal cylinder connected to earth,each end of said cylinder having a head with a central screw threadedopening therein, a plug of insulating material adapted to screw intoeach of said openings, one of said plugs having a central perforation onits inner end connecting with an enlarged perforation at its outer end,a centrally perforated wire holding plug fitting said enlargedperforation, a wire, one end of which extends through said centralperforation and is secured to the wire holding plug, the otherinsulating plug having a screw threaded perforation on its inner endconnected with an enlarged screw threaded opening extending to the outerend, a screw fitting the inner perforation and having secured to itsinner end the other end of said wire and an electric cable screwed intothe outer opening and making contact with the outer end of said screw.7,

8. The herein described apparatus for static electricity consisting of aneutralizing static electricity consisting of a passing through the saidperforated guide hollow perforated metal cylinder connected and anelectric cable connected with one plug to earth, made up of sections orunits of equal in electrical contact with said wire.

length, each unit having in each end a head In witness whereof I havehereunto set 5 with a central screw threaded opening therein, my handthis 2d day of January, 1908.

one end of each unit having a nipple passing through said opening, acentrally perforated WILLIAM CHAPMAN guide block extending through saidnipple, Wltnesses: insulating plugs in the outer ends of the end S. W.BATES,

10 units, a wire secured to said end plugs and ELEANOR W. DENNIS.

